11577 - Letter frequency/11577.cpp

   1 /*
   2   Problem:
   3   Andrés Mejía-Posada (andmej@gmail.com)
   4 */
   5 using namespace std;
   6 #include <algorithm>
   7 #include <iostream>
   8 #include <iterator>
   9 #include <sstream>
  10 #include <fstream>
  11 #include <numeric>
  12 #include <cassert>
  13 #include <climits>
  14 #include <cstdlib>
  15 #include <cstring>
  16 #include <string>
  17 #include <cstdio>
  18 #include <vector>
  19 #include <cmath>
  20 #include <queue>
  21 #include <deque>
  22 #include <stack>
  23 #include <list>
  24 #include <map>
  25 #include <set>
  26
  27 #define foreach(x, v) for (typeof (v).begin() x = (v).begin(); x != (v).end(); ++x)
  28 #define For(i, a, b) for (int i=(a); i<(b); ++i)
  29 #define D(x) cout << #x " is " << x << endl
  30
  31
  32 int main(){
  33   int n;
  34   cin >> n;
  35   string s;
  36   getline(cin, s);
  37   while (n--){
  38     map<char, int> f;
  39     getline(cin, s);
  40     for (int i=0; i<s.size(); ++i){
  41       s[i] = tolower(s[i]);
  42       if (isalpha(s[i])) f[s[i]]++;
  43     }
  44     int best = 0;
  45     string ans = "*";
  46     for (map<char, int>::iterator i = f.begin(); i != f.end(); ++i){
  47       if(i->second > best){
  48         best = i->second;
  49         ans = string(1, i->first);
  50       }
  51       else if (i->second == best){
  52         ans += i->first;
  53       }
  54     }
  55     sort(ans.begin(), ans.end());
  56     cout << ans << endl;
  57   }
  58
  59   return 0;
  60 }